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Dynamic Nuclear Polarization with Polychlorotriphenylmethyl Radicals: Supramolecular Polarization‐Transfer Effects
Author(s) -
Gabellieri Cristina,
Mugnaini Veronica,
Paniagua Juan Carlos,
Roques Nans,
Oliveros Malena,
Feliz Miguel,
Veciana Jaume,
Pons Miquel
Publication year - 2010
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201000031
Subject(s) - radical , polarization (electrochemistry) , supramolecular chemistry , chemistry , photochemistry , crystallography , crystal structure , organic chemistry
Ups and downs of DNP : Polychlorinated trityl radicals (see structure: C black, Cl green, Na gray, O red) used for dynamic nuclear polarization (DNP) showed a new transfer mechanism involving quadrupolar chlorine nuclei. The observation of positive or negative enhancements, depending on the substrate, highlights the supramolecular character of the initial polarization‐transfer process.